GF Signet 9900-1BC Produktanleitung Seite 9

Relay and Open Collector Wiring
Open Collector Wiring
• Longer life than a mechanical relay
• No moving parts
• Faster ON/OFF switching capabilities than mechanical relays
• Can switch DC voltage only (< 30 VDC, < 50 mA)
• Not recommended for use with inductive loads
Fail-Safe Behavior
No matter the setting, the Open Collector output turns off if the 9900 loses power.
This must be taken into account when evaluating system failure consequences.
If the system layout requires a "closed" or "on" condition for the output in case of
power loss, a mechanical dry-contact relay (NC contacts) must be used instead of
the Open Collector (R1) output.
The 9900 Open Collector (R1) output provides high-speed switching capability. Signal
frequencies can reach 400 pulses per minute.
The 9900 Open Collector (R1) output connection is dependent upon the type of circuit
being controlled by the output.
Most indicating instruments or control system inputs require a signal voltage of 0 to 5 V
(TTL or CMOS logic levels) or 0 to 24 V. Therefore, the 9900 Open Collector output
circuits must be equipped with a pull-up or pull-down resistor (not supplied), and a
quality regulated 5 to 24 V (depending on the application) power supply (not supplied)
is recommended to function properly.
NPN Style Wiring
PWR +
PWR –
Loop +
Loop –
OC –
If an external device needs logic 0
(logic LOW) input when the Open
Collector is de-energized in an NPN
confi guration, set R1 NORMAL to
CLOSED in the RELAY menu.
Pull-Up Resistor
Power
Supply
Gnd
OC +
Input
PLC
Gnd
PWR +
PWR –
Loop +
Loop –
OC –
Loop +
Alarm
V+
OC +
Gnd
9900-1BC Batch Controller Manual
PNP Style Wiring
Input
Gnd
OC +
Supply
Gnd
Pull-Down Resistor
Power with NORMAL
Supply
set to OPEN.
PLC
Power
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